An American alleged by police to be the “most active” known protester at the G20 riots remains in custody after his extradition to Canada.

Kevin Chianella, 20, of Queens, N.Y., has been charged with 53 counts related to the riots. He is alleged to have smashed the window of a police car with the officer still inside during the June 2010 summit.

Toronto police Det. Sgt. Gary Giroux said Chianella allegedly caused at least $300,000 in damage. “Nobody (else) even comes close to that number,” he said.

Chianella appeared briefly in a Toronto court Wednesday, but his bail hearing was postponed to Thursday while he awaits a surety.

A second man, Richard Dean Morano, 22, of Lackawaxen, Pa., stood silently during his hearing as he was released on $80,000 bail.

His mother and sister were in the courthouse, but declined to comment.

Giroux noted Morano is alleged to have caused more than $100,000 in damage at the G20.

Morano faces 14 charges, including six counts of mischief over $5,000, three counts of mischief endangering life and assaulting a police officer with a weapon.

Giroux said U.S. marshals transported Morano and Chianella, who did not fight their extradition, to Philadelphia where they were met by four Toronto police officers for their flight here on Tuesday.

Last week, Boston architect Quinn McCormic, 25, voluntarily returned to Canada to face his G20-related charges.

Two Americans are still wanted by Canadian authorities: Dane Rossman is in custody in Tuscan, Ariz., and Joel Bitar is expected to fight his extradition in a New York court later this month.